A growing demand for online services and data means a growing demand for data centers, which require water to keep them cool. This is very energy-intensive - using large amounts of environmental resources. Evaporative cooling uses less energy, but the process requires more water.Google is paying more attention to water use in recent years. It relies on recycled water or seawater where it can, to avoid using drinking water and draining local supplies. Google also says it saves water by recirculating it through cooling systems multiple times.

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